Influence of the properties of advanced fuels on the hydrodynamic non-stationary effect in GTE fuel systems

Аuthors

Aslanov A. R.¹, Kraev V. M.^2*, Myakochin A. S.², Siluyanova M. V.²

1. ,
2. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: kraevvm@mail.ru

Abstract

The creation of new aircraft engines sets the task of new types aviation fuels implementation, such as hydrogen, propane, methane, etc. In the history of the Russian aircraft industry, options for creating aircraft engines using alternative fuels to kerosene have already been considered. For example, in the 90s, as part of the tests, the aircraft Tu-155 flights provided test flights, both on hydrogen and methane. However, these promising works were closed due to the difficult economic situation in the country. Nevertheless, the research conducted at that time showed the fundamental possibility and significant economic feasibility of switching to new types of fuels. Based on the results of the Tu-155 project, the developers have introduced new requirements for the fuel system, which are related to the specific thermal and physical properties of promising fuels. These requirements necessitate the development and creation of mathematical models to account for the effects of non-stationary operating conditions of new-generation aircraft engines. Essentially non-steady modes of an aircraft engine are transitions from idle mode to take off mode during take off and to thrust reverse engagement mode during landing. If non-stationary conditions are not taken into account, an uncalculated operation mode is possible until the engine shut off. The results of numerical modeling of the effect of hydro-dynamically unsteady conditions on the coefficient of friction presented. Unsteady processes are inherent in the operation of each gas turbine engine because they accompany all transient modes. This effect is insignificant for traditional aviation fuels, such as kerosene. However, when using advanced fuels such as liquid hydrogen, propane and methane, unsteady conditions can significantly affect the heat transfer and hydrodynamics processes, and such an influence requires assessment and accounting. The most common type of unsteady conditions for aviation fuels is hydrodynamic unsteadiness, i.e. a significant change in fuel consumption during the transition from low-gas mode to take off mode, as well as activation of thrust reversal during aircraft braking. The aim of the work is to identify the effect of dependence of the scale of unsteady impact on the properties of promising fuels. The result shows a significant dependence of the physical properties influence of liquid hydrogen, propane and methane on the change in hydraulic resistance under unsteady impact on the flow, and will be useful in the design of fuel systems of promising aircraft engines.

Keywords:

aviation gas turbine engines, cryogenic fuel, non-stationary processes, hydrodynamics and heat trans-fer in channels

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